Mr . : For tomorrow , read pages 12 to 20 . Then do exercises one through ten on page 21 .   Do we have to type out our homework ?   Mr . : No . You only do that when you write reports .   Is there anything else ?   Mr . : For those of you who don't have a calculator , get one .   We are allowed to use a calculator in class ?   Mr . : Yes . By the way , review today's notes this evening . We may have a small quiz tomorrow . 